The theoretical and experimental study of AC harmonics of twelve-pulse railway rectifiers

The authors deal with the AC harmonics of twelve-pulse uncontrolled rectifiers of Istanbul Light-Railway System. The experimental results are obtained by a data-acquisition system. The theoretical values are computed by the piecewise estimation technique and SPICE technique. The latter technique is used for taking the phase and amplitude unbalances, interphase transformer asymmetry and time varying behavior of the load into account. The correlation between experimental and theoretical values are found to be satisfactory